Question

A drum and burgle corps rents instruments to members. Each burgle rents for $10 per month and each drums rents for $5 per month. Find the monthly income I if members rent 7 burgled and 9 drums. Then find the monthly income if members rent 9 burgled and 7 drums.

Answer 1

Case I

$115

Case II

$125

Explanation:

Bugles rent for $10 per month

Drums rent for $5 per month

Case I

7 bugles and 9 drums

7 * bugle cost per month + 9 * drum cost per month

7 * 10 + 9* 5

70 + 45

$115

Case II

9 bugles and 7 drums

9 * bugle cost per month + 7 * drum cost per month

9 * 10 + 7* 5

90 + 35

$125